User:K.arya101

Difference between thermodyanamics and heat transfer Thermodynamics and Heat Transfer both are part of thermal engineering and each has its own meaning and importance. Both deals with heat and energy then, one might ask, what is the real difference between the two subjects ? Thermodynamics and Heat Transfer "Thermodynamics" deals with the amount of energy in form of heat or work during a process and only considers the end states in equilibrium. It will not give information about how long it will take to reach to the final state in equilibrium. While,

"Heat Transfer" deals with the rate of energy transfer thus, it gives idea of how long a heat transfer will occur? Heat transfer deals with time and non equilibrium phenomena. Heat can only transfer when there is a temperature gradient exists in a body and which is indication of non equilibrium phenomena. In short, Thermodynamics gives "Why" a process will occur and Heat Transfer will tell, "How" a process will occur when there is a concern about transfer of heat. To support all these arguments,

Heat Transfer uses:- Fourier's Law (Heat conduction) Newtons Law of Cooling (Heat convection) Planck's Law (Thermal Radiation) Stephan Boltzman's Law (Thermal Radiation) Wein's Law (Thermal Radiation) Kirchoff's Law (Thermal Radiation) Lambart's Law (Thermal Radiation)

Thermodynamics uses following laws:- Zeroth Law of Thermodynamics First law of Thermodynamics Second Law of Thermodynamics Third Law of Thermodynamics

Basic Low of thermodynamics

Thermodynamics is the study of relationship between energy and entropy, which deals with heat and work. It is a set of theories that correlate macroscopic properties that we can measure (such as temperature, volume, and pressure) to energy and its capability to deliver work. A thermodynamic system is defined as a quantity of matter of fixed mass and identity. Everything external to the system is the surroundings and the system is separated from the surroundings by boundaries. Some thermodynamics applications include the design of: •air conditioners and refrigerators •turbo chargers and superchargers in automobile engines •steam turbines in power generation plants •jet engines used in aircraft

Zeroth Law of Thermodynamics:- The zeroth law of thermodynamics states that when two bodies have equality of temperature with a third body, they in turn have equality of temperature with each other. All three bodies share a common property, which is the temperature. For example: one block of copper is brought into contact with a thermometer until equality of temperature is established, and is then removed. A second block of copper is brought into contact with the same thermometer. If there is no change in the mercury level of the thermometer during this process, it can be said that both blocks are in thermal equilibrium with the given thermometer.

First Law of Thermodynamics:- The first law of thermodynamics states that, as a system undergoes a change of state, energy may cross the boundary as either heat or work, and each may be positive or negative. The net change in the energy of the system will be equal to the net energy that crosses the boundary of the system, which may change in the form of internal energy, kinetic energy, or potential energy. The first law of thermodynamics can be summarized in the equation:

Second Law of Thermodynamics:- The second law defines the direction in which a specific thermal process can take place. The second law of thermodynamics states that it impossible to construct a device that operates in a cycle and produces no effect other than the transfer of heat from a cooler body to a hotter body. The second law of thermodynamics is sometimes called the law of entropy, as it introduces the important property called entropy. Entropy can be thought of as a measure of how close a system is to equilibrium; it can also be thought of as a measure of the disorder in the system.

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